diff --git a/Components/AY38910/AY38910.cpp b/Components/AY38910/AY38910.cpp
index c32df440e..0984b94ac 100644
--- a/Components/AY38910/AY38910.cpp
+++ b/Components/AY38910/AY38910.cpp
@@ -376,6 +376,19 @@ void AY38910SampleSource<is_stereo>::set_control_lines(ControlLines control_line
 	update_bus();
 }
 
+template <bool is_stereo>
+void AY38910SampleSource<is_stereo>::reset() {
+	// TODO: the below is a guess. Look up real answers.
+
+	selected_register_ = 0;
+	std::fill(registers_, registers_ + 16, 0);
+
+	task_queue_.enqueue([&] {
+		std::fill(output_registers_, output_registers_ + 16, 0);
+		evaluate_output_volume();
+	});
+}
+
 template <bool is_stereo>
 void AY38910SampleSource<is_stereo>::update_bus() {
 	// Assume no output, unless this turns out to be a read.
diff --git a/Components/AY38910/AY38910.hpp b/Components/AY38910/AY38910.hpp
index acdc945b7..755861dcf 100644
--- a/Components/AY38910/AY38910.hpp
+++ b/Components/AY38910/AY38910.hpp
@@ -81,6 +81,9 @@ template <bool stereo> class AY38910SampleSource {
 		/// Sets the current control line state, as a bit field.
 		void set_control_lines(ControlLines control_lines);
 
+		/// Strobes the reset line.
+		void reset();
+
 		/*!
 			Gets the value that would appear on the requested interface port if it were in output mode.
 			@parameter port_b @c true to get the value for Port B, @c false to get the value for Port A.
@@ -116,12 +119,12 @@ template <bool stereo> class AY38910SampleSource {
 		Concurrency::AsyncTaskQueue<false> &task_queue_;
 
 		int selected_register_ = 0;
-		uint8_t registers_[16] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
-		uint8_t output_registers_[16] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
+		uint8_t registers_[16]{};
+		uint8_t output_registers_[16]{};
 
-		int tone_periods_[3] = {0, 0, 0};
-		int tone_counters_[3] = {0, 0, 0};
-		int tone_outputs_[3] = {0, 0, 0};
+		int tone_periods_[3]{};
+		int tone_counters_[3]{};
+		int tone_outputs_[3]{};
 
 		int noise_period_ = 0;
 		int noise_counter_ = 0;
diff --git a/Machines/Apple/AppleII/Mockingboard.hpp b/Machines/Apple/AppleII/Mockingboard.hpp
index b3a3c1dcf..afb7555ce 100644
--- a/Machines/Apple/AppleII/Mockingboard.hpp
+++ b/Machines/Apple/AppleII/Mockingboard.hpp
@@ -107,8 +107,9 @@ class Mockingboard: public Card {
 						)
 					);
 
-					// TODO: all lines disabled sees to map to reset? Possibly?
-					// Cf. https://gswv.apple2.org.za/a2zine/Docs/Mockingboard_MiniManual.html
+					if(!value) {
+						ay.reset();
+					}
 				} else {
 					ay.set_data_input(value);
 				}